An efficient mixed reagent for the direct synthesis of symmetrical carboxylic anhydrides from carboxylic acids is presented. Carboxylic acids are converted to anhydrides using triphenylphosphine / trichloroisocyanuric acid, under mild reaction conditions at room temperature. Short reaction time, excellent yields of products, low cost, and availability of reagents, simple experimental procedure, and easy work-up of the products are the advantages of this procedure.

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